Kim Soo Hyun proved how action scenes are always as hard to act in as they look.

On April 30, the actor appeared at the launch of the film Be Covert, Be Great held in Seoul.

"I thought hard about how I should show Won Ryu Hwan blending into the village," he said.

In the film, Kim Soo Hyun appears as a North Korean spy pretending to be a fool.

"Action school was the hardest," he said. "It hurt a lot because I had to use my body a lot."

He also said about his role, "It was important to really look like a fool, but rather than doing research, I tried to bring out what was already inside of me. Everyone has a fool inside themselves, even me. It was fun."

He then put on his best act to laughs from his audience.

Be Covert, Be Great is about North Korean spies who are given a mission. It premieres on June 5.

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